c语言中类似c++自动析构的实现

#include <stdio.h>

#define _MESA_TRACE_SCOPE_VAR_CONCAT(name, suffix) name##suffix
#define _MESA_TRACE_SCOPE_VAR(suffix)                                        \
   _MESA_TRACE_SCOPE_VAR_CONCAT(_mesa_trace_scope_, suffix)

/* This must expand to a single non-scoped statement for
 *
 *    if (cond)
 *       _MESA_TRACE_SCOPE(...)
 *
 * to work.
 */
#define _MESA_TRACE_SCOPE(name)                                              \
   int _MESA_TRACE_SCOPE_VAR(__LINE__)                                       \
      __attribute__((cleanup(_mesa_trace_scope_end), unused)) =              \
         _mesa_trace_scope_begin(name)

static inline int
_mesa_trace_scope_begin(const char *name)
{
    printf("start\n");
   return 0;
}

static inline void 
_mesa_trace_scope_end(int *scope)
{
    printf("end\n");
}

#define MESA_TRACE_FUNC() _MESA_TRACE_SCOPE(__func__)


int main() {
    MESA_TRACE_FUNC();
	printf("main\n");
    return 0;
}

运行输出：